JPH052167B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a device for measuring the inner diameter of a tubular object.

[Prior art]

Conventionally, devices for measuring the inner diameter of tubular objects include:
The following are known: The device can be broadly divided into a cylindrical measuring head that is fitted into a tubular measuring object;
It has a columnar grip part for supporting the measurement head and for the operator to grip it, and a display part for displaying the measured value. Then, a contact is provided that protrudes movably from a window formed in the measuring head and contacts the pipe wall of the object to be measured, and the distance between the movable levers that support this contact is converted into an electrical signal to obtain the measured value. It is intended to be displayed on the display unit. The device having such a configuration is battery-powered, and the measuring head, grip section, and display section are integrally constructed for convenient portability. When the operator holds the gripping section and inserts the measuring head into the tubular object, the measured value is automatically displayed on the display section.

[Problems to be solved by the invention]

However, with such devices, when used in an upright position, the measured values are displayed in an upright position, making them easy to read, but if the device is used on its side or upside down, the displayed measured values are also displayed on its side. , the problem is that it falls over and is very difficult to read. Such a device has the advantage of portability in that even if the object to be measured is normally immovable, the device can be moved freely and inserted into a tubular body facing in any direction to measure the inner diameter. Therefore, such a device is not always used in an upright position, and when it is not used in an upright position, it has the disadvantage that the display is difficult to see and the usability of the device is poor. The present invention has been made in order to improve the above-mentioned problems, and its purpose is to improve the usability of an inner diameter measuring device.

[Means to solve the problem]

The structure of the invention for solving the above problems is as follows. That is, the present invention provides: a cylindrical measuring head that is fitted into a tubular measuring object whose inner diameter is to be measured; a columnar grip that supports the measuring head; and a diameter line and a cylindrical side surface of the measuring head. A pair of contacts that move in the inner and outer directions of the cylindrical side surface from a pair of windows provided at the intersection and come into contact with the inner wall of the object to be measured during measurement, and a pair of movable levers that screw the pair of contacts so that they can move forward and backward. and an elastic member that biases and supports the movable lever in a direction in which the contact comes into contact with the measurement object when fitting onto the measurement object, and an elastic member that is provided on the pair of movable levers and supports the movable lever a displacement sensor that converts the relative displacement of the unit into an electrical quantity; a displacement detection circuit that is connected to the displacement sensor and outputs the relative displacement as an electrical signal and that is provided on the gripping portion; a first connector provided on the grip; a display head for displaying measured values; a first attachment means provided on the grip for removably fixing the display head to the grip; a second mounting means that engages with the first mounting means and is provided on the display head; and a second mounting means that is provided on the display head and receives a signal from the displacement detection circuit, processes the signal, and displays a measured value. a control device provided on the display head, a display device that is controlled by the control device and displays the measured value, a second connector connected to the control device and provided on the display head; a third connector formed and connected to the first connector and a third attachment means that engages the first attachment means; and a third connector formed at the other end and connected to the second connector. a relay cable having a fourth connector that engages with the second attachment means; and a relay cable that has a fourth connector that engages with the second attachment means; The connector and the second connector are coupled, and the first attachment means and the second
When the display head is detached from the gripping portion, the first connector and the third connector are coupled, and the first attachment means and the third connector are engaged with each other.
The second connector and the fourth connector are coupled together, and the second attachment means and the fourth attachment means are engaged with each other. Here, when the control device is placed in the display head,
There is an advantage that one display head can be used in common for a plurality of measuring heads and gripping parts. In addition, the grip section is equipped with a battery that is the power source for the displacement detection circuit, control device, and display device, and the display head side is charged from the battery when the display head and the grip section are electrically connected. If a capacitor is provided, the device on the display head side can be driven even when the display head is removed from the grip, for example, to retain the contents of the memory or continue displaying the measured value. It has the advantage of being able to do

[Effect]

When the measuring head is fitted into a tubular object to be measured, the contact protruding from the cylindrical side surface of the measuring head is urged toward the wall of the object by the elastic member and comes into contact with the wall. The movable lever deforms as the contact moves, changing the distance between the movable levers. The distance between the movable levers is converted into an electrical quantity by a displacement sensor, and the changed electrical quantity is output as an electrical signal to a control device by a displacement detection circuit. After processing the signal, the control device displays the measured value on the display device. Such a device is used in two ways: The first method is to use the display head by attaching it to the grip. In this case, the first connector provided on the grip and the second connector provided on the display head are connected, and the two are electrically connected. Therefore, the measurement head and the display head are both erected in the same direction, and can be used as a device in which the measurement head, the grip section, and the display head are integrated. The second is a mode in which the display head is detached from the grip portion and used. In this case, the first connector provided on the grip section and the third connector of the relay cable are connected, and the second connector provided on the display section and the fourth connector of the relay cable are connected. used. Therefore, the display head can be used erect at all times regardless of the orientation of the measurement head, making it easier to read the measured values. In this way, one measurement device can be used in the two modes of use depending on the measurement environment, so it is possible to have both advantages of portability and ease of viewing measured values.

【Example】

The present invention will be explained below based on specific examples. FIG. 1 is a partial sectional view showing the structure of an inner diameter measuring device according to a specific embodiment of the present invention, and FIG. 5 is a block diagram showing the electrical structure of the device. In the figure, 1 is a measuring head, 3 is a gripping part, and 5 is a display head. The cylindrical side surface 10 of the measuring head is fitted onto the tubular measuring object 2 . A pair of windows 11a and 11b are provided on the diametrical line of the cylindrical side surface 10, and contacts 12a and 12b are provided so as to be movable in the X-axis direction through the windows. The contacts 12a, 12b are connected to movable levers 13a, 1 by means of screws 14a, 14b.
It is screwed into 3b. And contactor 12a, 1
2b is adjusted by screws 14a, b so that the contact surfaces 120a, b at the tips protrude from the cylindrical side surface 10 and come into contact with the wall surface 2a of the measurement object 2. The movable levers 13a, 13b are supported by a support plate 15, which is one of the elastic members, and the support plate 15 is fixed to a fixed block 31 protruding from the side wall 30 of the grip portion 3. Further, both movable levers 13a and 13b are elastically coupled by a coil spring 17, which is another elastic member. When the measuring head 1 is fitted onto the object 2 and the contacts 12a, b abut against the wall surface 2a of the object 2 and are pushed inward, the flexible portions 16a, b of the support plate 15 bend inward and , coil spring 1
7 is retracted, and the contacts 12a, b are urged outward. Therefore, the contact surfaces 120a, b accurately contact the wall surface 2a of the object to be measured. A tube body 24 is fixed to the movable lever 13b, and a detection coil 21 is installed inside the tube body 24.
is installed. On the other hand, a rod 23 is fixedly attached to the movable lever 13a.
A core 22 is fixedly installed at the tip of 3. core 2
The relative position of the coil 21 and the movable lever 13
The spacing between a, b and therefore the contacts 12a,b
It changes in proportion to the interval between. In the displacement sensor 20 having such a configuration, the inductance changes depending on the position of the core 22 with respect to the coil 21, and the change is detected as an amount of electricity. The measuring head 1 and the gripping part 3 have flanges 18 and 3.
2, and is removably connected by a bolt 33. Coil 21 is connected to displacement detection circuit 40 . As a mechanical attachment/detachment mechanism between the display head 5 and the grip portion 3, a flange 36 formed integrally with the display head 5 and a fixing ring 37 rotatable with respect to the flange and threaded on the inner surface are provided. ing. The flange 36 abuts the end of the side wall 30, and the fixing ring 37 is threadedly engaged with a screw formed in the side wall 30. The display head 5 and the grip 3 are aligned by the locking plate 59 coming into contact with the locking plates 39a, 39b on the side of the grip 3.
Furthermore, the grip portion 3 and the display head 5 are connected to the connector 34,
It is electrically connected by 35. Inside the grip part 3, in addition to the displacement detection circuit 40, a battery 44,
A switching circuit 42 that controls power supply to the displacement detection circuit 40 using a control signal from the CPU 50
and are provided. On the other hand, the front surface of the display head 5 is provided with a display panel 54 and an input switch 56 for setting the operating mode. Inside the display head 5, a CPU 50, a timing signal generation circuit 58 connected thereto, and a control program are stored.
ROM 55, RAM 57 for storing constants, etc., latch circuit 53 for holding display values, and drive circuit 52.
and a capacitor 51 that is charged from the battery 44. When the display head 5 is electrically connected to the gripping part 3, the devices provided in the display head 5 are powered by the battery 44, and the display head 5 is electrically disconnected from the gripping part 3. When the power is on, power is supplied by the charged capacitor 51. Therefore, even when the display head 5 is removed, the contents of the memory can be retained and the measured values can continue to be displayed on the display panel. In FIG. 5, 34a-e, 35a-e are terminals of the connectors 34, 35. Further, the output signal of the timing signal generation circuit 58 is transmitted to the connector terminals 35e, 34e, the short circuit line 340, the terminal 34d,
It is input to the interrupt input terminal NMI via 35d. By doing this, when the display head 5 is removed, the synchronization signal S1 is
Since no input is made to the CPU 50, the CPU 50 can be automatically stopped in a low power consumption mode. In such a configuration, the input switch 56
When this device is set to measurement mode, CPU5
0 operates in synchronization with the synchronization signal S1 from the timing signal generation circuit 58, reads the output signal from the displacement detection circuit 40, processes the signal, and then
The measured display value is calculated and the value is output to the latch circuit 53. As a result, the measured value is displayed on the display panel 54. When the display head 5 is integrated with the grip 3, the device is used as shown in FIG. The display head 5 of this device can be removed from the grip 3. When the display head 5 is removed, the device can be operated by electrically connecting the display head 5 and the grip portion 3 with a relay cable 60 shown in FIG. The relay cable 60 has a plug 62 and a socket 64. The plug 62 engages with the grip 3, and the socket 64 engages with the display head 5. A connector 66 of the plug 62 is electrically connected to the connector 34 of the grip part 3. Also, the connector 68 of the socket 64 is connected to the connector 35 of the display head 5. The plug 62 has a support tube 70 and a fixing ring 72 rotatably engaged therewith. The inner wall of the fixing ring 72 is threaded, and it screws into the side wall 30 of the gripping part 3. Further, a locking plate 74 is provided at the center of the plug 62 in order to prevent rotation of the support tube 70 when the plug 62 is screwed onto the gripping part 3. Locking plates 39a, b provided in section 3
It comes into contact with and is locked. On the other hand, the socket 64 has a support tube 80 with a thread 81 cut on its outer surface, into which the fixing ring 37 of the display head 5 is screwed. and,
When the locking plate 59 of the display head 5 comes into contact with the locking plates 83a and 83b of the socket 64, the display head 5 is secured when the fixing ring 37 is screwed into the socket 64.
This prevents rotation. Hold the display head 5 with the grip part 3
When used separately from the fourth
Used as illustrated in the figure. As described above, the device of this embodiment has a display head 5.
It is also possible to use it by assembling it integrally with the gripping part 3. It is also possible to use the display head 5 by removing it from the grip 3 and electrically connecting the display head 5 and the grip 3 with the relay cable 60.
In this case, the display head 5 can be erected regardless of the orientation of the measurement head 1.

【Effect of the invention】

As described above, the present invention provides a first connector and a first attachment means on the gripping part, and a second connector connected to the first connector and a first attachment means on the display head.
Since the display head is provided with the second attachment means that engages with the attachment means of the second attachment means, the display head can be configured to be detachable from the grip portion. Further, in the device of the present invention, a third connector connected to the first connector provided on the grip portion and a third attachment means that engages with the first attachment means are formed at one end, and the display head The relay cable has a fourth connector connected to the second connector provided at the second connector and a fourth attachment means that engages with the second attachment means formed at the other end. Therefore, when the display head is separated from the grip, the grip and one end of the relay cable are mechanically and electrically connected, and the other end of the relay cable and the display head are mechanically and electrically connected. By doing so, the inner diameter can be measured with the display head detached from the grip part, and the measured value can be displayed on the display head that is spaced apart. Therefore, when the display head is attached to the grip part and used integrally using the first connector, the first attachment means, the second connector, and the second attachment means, the inner diameter measuring device portability is ensured. Also, remove the display head from the grip and
When the display head and the gripping section are connected via a relay cable, the display head can always be used upright regardless of the orientation of the object to be measured, making it easier to read the displayed value. Furthermore, even if the object to be measured is in a crowded place, placing the display head in an open place makes the display easier to see. Furthermore, since one display head can be attached to and removed from the grip, the electronic circuit that drives the display head is common and simple, regardless of whether the display head is attached to the grip or detached. Since it is only one, the configuration of the electronic circuit becomes simple. Furthermore, since the display head can be used in common and can be replaced with other combinations of measuring heads and gripping parts, usability is improved.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view showing the configuration of an inner diameter measuring device according to a specific embodiment of the present invention, FIG. 2 is a partial sectional view showing the configuration of a relay cable, and FIG. 3 is a partial sectional view showing the configuration of a relay cable. 4 is an explanatory diagram showing how the device is used, and FIG. 5 is a block diagram showing the electrical configuration of the device. DESCRIPTION OF SYMBOLS 1... Measuring head, 2... Measurement object, 3... Gripping part, 5... Display head, 10... Cylindrical side surface, 12a, b... Contactor, 13a, b... Movable lever, 15... Support Plate, 21...Detection coil, 22...Core, 3
0...Side wall (first attachment means), 39a, 39b
... Locking plate (first mounting means), 36 ... Flange (second mounting means), 37 ... Fixing ring (second mounting means), 59 ... Locking plate (second mounting means) ), 34... connector (first connector), 35
... Connector (second connector), 66 ... Connector (third connector), 68 ... Connector (fourth connector), 62 ... Plug (third attachment means), 70 ... Support tube ( third attachment means), 72...
...Fixing ring (third mounting means), 74...Lock plate (third mounting means), 64...Socket (fourth mounting means)
(attachment means), 80...support cylinder (fourth attachment means), 81...screw (fourth attachment means), 83a,
83b...Lock plate (fourth attachment means), 60...
Relay cable.

Claims (1)

[Scope of Claims] 1. A cylindrical measurement head that is fitted into a tubular measurement object whose inner diameter is to be measured; a columnar grip that supports the measurement head; a diameter line and a cylindrical side surface of the measurement head; a pair of contacts that move inward and outward directions of the cylindrical side surface from a pair of windows provided at the intersection of the two, and come into contact with the inner wall of the object to be measured during measurement; and a pair of movable contacts that screw the pair of contacts so that they can move forward and backward. a lever; an elastic member that biases and supports the movable lever in a direction in which the contact contacts the measurement object when the lever is fitted onto the measurement object; a displacement sensor that converts the relative displacement of the lever into an electrical quantity; a displacement detection circuit that is connected to the displacement sensor and outputs the relative displacement as an electrical signal and that is provided on the gripping section; and a displacement detection circuit that is connected to the displacement detection circuit; a first connector provided on the gripping portion; a display head for displaying a measured value; a first attachment means provided on the gripping portion for removably fixing the display head to the gripping portion; a second mounting means that engages with the first mounting means and is provided on the display head; and a second mounting means that is provided on the display head and receives a signal from the displacement detection circuit, processes the signal, and generates a measured value. a control device for displaying; a display device provided on the display head and controlled by the control device to display the measured value; a second connector connected to the control device and provided on the display head; a third connector connected to the first connector and a third attachment means formed at the other end and engaged with the first attachment means; and a third attachment means formed at the other end and connected to the second connector; and a fourth attachment means that engages with the second attachment means, and when the display head is attached to the grip part, the first and the second connector are coupled together, and the first attachment means and the second
When the display head is detached from the gripping portion, the first connector and the third connector are coupled, and the first attachment means and the third connector are engaged with each other.
, the second connector and the fourth connector are coupled, and the second attachment means and the fourth attachment means are engaged. Internal diameter measuring device.